Computed EEG Topography — Theory, Implementation and Application

Abstract

Taken at first glance, the EEG appears to be merely a mixture of sinusoids ranging in frequency from 1 to 30 Hz with variations in frequency, phase relation and amplitude that are a function of the scalp location from which they are recorded, the state of activity of the subject and the state of the underlying brain. When a normal subject is maintained in the same state of activity repeated samples of more than 15–20 seconds in duration will lead to similar frequency distributions and similar amplitude statistics within a single channel. It is this predictable stability of the EEG signal that allows the estimation of altered states of activity related to altered function or disease.

Keywords

Slow Wave Background Activity Alpha Activity Slow Activity Sharp Wave

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